Pencil attachment for pantographs



(No Model.)

WITNESSES:

J. T.GREGORY;

Pencil Attachment for Pantographs.

" Patented may 25,1880.

ATTORNEYS- PETERS, FHOTO-LITHOGRAPHER, wAsmNeTouh-hc;

warns PATENT FHQE.

JAMES T. GREGORY, OF ATHENS, TENNESSEE.

PENCIL ATTACHMENT FOR PAINTOGRAPHS.

SPECIFICATION forming part of Letters Patent No. 228,062, dated May 25,1880.

Application filed March 23, 1880.

To all whom it may concern:

Be it known that I, JAMES T. GREGORY, of Athens, in the county of McMinnand State of Tennessee, have invented certain new and usefulImprovements in Pantographs; and I do hereby declare that the followingis a full, clear, and exact description of the invention, which willenable others skilled in the art to which it appertains to make and usethe same, reference being bad to the accompanying drawings, which form apart of this specification, and in which Figure 1 1s a perspective Viewof a pantograph embodying my improvements. Fig. 2 is a vertical sectionthrough the tracing-point. Fig. 3 is a similar section through thedoublepointed pencil; and Figs. 4 and 5are detail views, representing,respectively, the tracingpoint and pencil (the construction of whichconstitutes my improvement) detached from the rules.

Similar letters of reference indicate corresponding parts in all thefigures.

Myimprovement has relation to pantographs, (sometimes calledsmithographs,) or instruments for copying, enlarging, or reducing drawings of all kinds; and it consists in an improved construction of thetracing-point and pencil, substantially as hereinaftermore fully setforth, and particularly pointed out in the claims.

In the drawings, A B are two slats or rules, which are jointed at O; andD E, the second pair of rules, which are jointed at F. Each rule isperforated with a series of holes, and the first pair, A B, is providedwith thumbscrews, by which they may be connected to D E at either of theholes of the series.

G is a block or chair for the attachment of the instrument upon thedrawing board or table, it being provided with a sharp point, g, andgimlet-pointed thumb-screw h for that purpose. The first rule, A, ispivoted upon the chair at a, and is connected near its end to adetachable upright or standard, H, by a cord, 1, which serves to holdthe instrument in a level position upon the table.

Through the joint or apex F of the rules D E is inserted a soft-irontracing-point, K, made with a round head, It, a short cylindrical shank,

l, a flattened section, m, and a long point, a.

(N0 model.)

The flattened part m is inserted through the lowermost slat, D, of thepair D E, (see Fig. 2,) which prevents this slat from turning on thepoint, holding it firmlyin its proper place, while the upper slat, E,has a free motion upon the cylindrical section I.

The pencil-point L, by which the fac-simile or copy is made, is insertedthrough an aper ture in the end of slat or rule B. This point isdouble-p0inted, as shown at b b, and is made with a notch, 0, in itsthick middle part, into which the rule fits, the pencil being held inplace by a small key or wedge, 61, inserted into the hole back of thenotch. By withdrawing this key the pencil can easily be reversed whenthe point in use becomes dull.

The manner. of using this class of instruments is well known andrequires no further description. I

The advantages of my improvement are, first, that the singletracing-point K, of the de scribed construction, makes a superior jointbetween the rules D E, which it connects, and being inserted rigidly (byits flattened part m) through the lowermost rule, it does not turn, butmoves steadily over the lines of the drawing which it is desired totrace; secondly, the pencil point is reversible, and requires no screwsor clamps to hold it in its place for working, its working-point beingalways at the proper distance from the paper on account of the notch 0,which prevents it from slipping through the aperture in the rule intowhich it is inserted.

Having thus described my invention, I claim and desire to secure byLetters Patent of the United States- In a pantograph, the combination,with the rules A B, of the double-pointed pencil L, having notch c andkey or wedge d, substantially as and for the purpose herein shown andspecified.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

J. T. GREGORY.

Witnesses E. N. NEWTON, R. A. ELLIs.

